According to the passage, how did de Sacy and Akerblad influence each other’s work?

A) De Sacy was able to build on Akerblad’s work and make a demotic alphabet.
B) Akerblad built on de Sacy’s work and made a demotic alphabet.
C) Akerblad and de Sacy worked together to make a twenty-nine-letter demotic alphabet.
D) De Sacy was able to fix many mistakes that Akerblad made.